M42 - Orion Nebula (Bruno LAILLER)

Celestial hemisphere: Southern · Constellation: Orion (Ori) · Contains: Great Orion Nebula · M 42 · M 43 · Mairan's Nebula · NGC 1976 · NGC 1982 · Orion Nebula · The star θ1Ori · The star θ2Ori

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M42 - Orion Nebula

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M42 - Orion Nebula

La nébuleuse d'Orion, également connue sous le matricule de M42 ou NGC 1976, est un nuage diffus qui brille en émission et en réflexion au cœur de la constellation du même nom. C'est la nébuleuse la plus intense visible à l'œil nu depuis l'hémisphère nord, de nuit et en l'absence de pollution lumineuse. Elle peut être facilement aperçue avec des jumelles.

Sa structure occupe un pan de ciel de 66 × 60 minutes d'arc, quatre fois plus étendu que la pleine lune. Sa taille est d'environ 24 années-lumière. Cet objet correspond à la principale partie d'un nuage de gaz et de poussières beaucoup plus vaste encore, le nuage d'Orion, qui s'étend sur près de la moitié de la constellation et contient en plus la boucle de Barnard et la nébuleuse de la Tête de Cheval.

En 2007, les nouvelles mesures disponibles, grâce notamment aux grands radiotélescopes intercontinentaux, Very Long Baseline Array, ont permis de ramener la distance de la nébuleuse de 1 500 années-lumière, comme on le croyait jusque-là, à environ 1 350 années-lumière de la Terre, soit un rapprochement virtuel d'environ 10 %.

La nébuleuse d'Orion contient un amas ouvert renfermant de nombreuses étoiles très jeunes et très chaudes (théta, le Trapèze), nées récemment et dont le rayonnement ionise à présent l'hydrogène environnant.

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Distribution of astrophotographers

This table shows the number of distinct astrophotographers who have been assigned and IOTD/TP award compared to the total number of images awarded.
	Distinct awarded users	Total awarded images
Image of the day
Top picks
Top pick nominations

Distribution of subject types

This table shows the distribution of awards per subject type, compared to the popularity of images of that subject type.
	Image of the day	Top pick	Top pick nominations	Total submitted
Deep sky
Solar system
Extremely wide field
Star trails
Northern lights
Noctilucent clouds
Landscape

Distribution of data sources

This table shows the distribution of awards per data source, compared to the popularity of images acquired from that data source.
	Image of the day	Top pick	Top pick nominations	Total submitted
Backyard
Traveller
Own remote observatory
Amateur hosting facility
Public amaeteur data
Professional, scientific grade data
Mix of multiple sources
Other
Unknown

The “AstroBin Image of the Day and Top Picks”, or IOTD/TP, is a long-running system to promote beautiful, interesting, peculiar, or otherwise amazing astrophotographs, with a focus on technical excellence. Learn more.

Submitted The date and time when you submitted this image for IOTD/TP consideration.	...
Views by Submitters (available since September 19th, 2023) Every image is assigned to 50% of available Submitters. In the event that at least 80% of them don't view the image before its time in the IOTD/TP process expires, it's assigned to the other 50% of Submitters and the process begins anew.
Promotions by Submitters When 3 distinct Submitters promote the image, it moves on to the next stage of the process: evaluation for Top Pick status. This requirement, in addition to anonymization of images and distribution to only a subset of them, prevents biases and ensures that the best images are selected.
Promotions by Reviewers When 3 distinct Reviewers promote the image, it moves on to the next stage of the process: evaluation for IOTD status.
Early dismissal Staff members have a lot of images to inspect on a daily basis, and they can dismiss images if they believe they don't meet the requirements for IOTD/TP selection. If an image is dismissed 5 times, it's removed from the process. This streamlines the process and ensures that any bias present in promotions could be overruled by other staff members.

Status	Basic success
Started	...
Astrometry.net job	4283662
PixInsight job	n/a
PixInsight queue size	n/a
PixInsight stage	n/a

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M42 - Orion Nebula

M42 - Orion Nebula

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M42 - Orion Nebula

M42 - Orion Nebula

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